1.

An ideal gas is undergoing a cyclic thermodynamic process in different ways as shown in the corresponding P-V diagrams in column 3 of the table. Consider only the path from state 1 to state 2. W denotes the corresponding work done on the system. The equations and plots in the table have standard notations as used in thermodynamic process. Hereis the ratio of heat capacities at constant pressure and constant volume. The number of moles in the gas in n. Which of the following options is the only correct representation of a process in whichDeltaU = Delta Q- P Delta V?

Answer»

(II) (iv) (R)
(III) (iii) (P)
(II) (iii) (P)
(II) (iii) (S)

Solution :(Please note that`W_(1to2)`is work done on the gas).
PROCESS 1 to 2 represents isobaric process.

`W_(1 to 2) = P(V_1 - V_2) = PV_1 = PV_2`
`Delta U= Delta Q - P Delta V` is correct.
No other combination is POSSIBLE.


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